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Microchip Technology MIC4574-5.0YN
- Part No.:
- MIC4574-5.0YN
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MIC4574-5.0YN.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
MIC4574-5.0YN from Microchip Technology is a fixed-output 5.0V, 0.5A step-down (buck) switching regulator with 200 kHz switching frequency, 4V–24V input range, ±3% output voltage accuracy over line and load, and thermal/overcurrent protection. It operates in industrial temperature range (–40°C to +85°C) and targets board-level DC-DC conversion in embedded power supplies.
For engineers reviewing the MIC4574-5.0YN datasheet, MIC4574-5.0YN pinout, MIC4574-5.0YN application, or MIC4574-5.0YN equivalent, key selection criteria include guaranteed 0.5A switch current, DIP-8 package compatibility with legacy LM2574 layouts, shutdown quiescent current <200 µA, and fixed 5.0V output tolerance under full load and input variation.
Technical Context
The MIC4574-5.0YN integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement voltage-mode PWM control. Feedback is internally tied to output for fixed 5.0V operation, eliminating external resistor networks.
Cycle-by-cycle current limiting and thermal shutdown provide fault protection without external sensing components. Internal frequency compensation and fixed 5.0V feedback path reduce design complexity versus adjustable versions while maintaining ±3% output regulation across 8V–24V input and 0.1A–0.5A load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±3% over 8V–24V input and 0.1A–0.5A load - ensures stable logic supply rail under varying source and load conditions |
| Switch Current | Guaranteed 0.5A - supports continuous 5V/0.5A output without derating at +85°C ambient |
| Switching Frequency | 200 kHz ±10% - enables ~2× smaller output inductor vs. 52 kHz LM2574, reducing footprint and cost |
| Input Voltage Range | 4V to 24V - accommodates wide-input industrial and automotive pre-regulation applications |
| Shutdown Current | <200 µA typical - minimizes system standby power in battery-backed or energy-sensitive designs |
| Efficiency | 77% typical at 0.5A, VIN=12V - delivers high conversion efficiency without synchronous rectification |
| Oscillator Accuracy | ±10% - sufficient for non-critical timing applications; no external timing component required |
Pinout & Package
Package: 8-Lead Plastic Dual In-line Package (PDIP), through-hole, RoHS-compliant, rated for –40°C to +85°C junction temperature. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Internally connected to 5.0V divider; shorted to output for regulation - no external resistors needed |
| 2 (SGND) | Signal Ground | Reference ground for internal error amplifier and oscillator - separate from power return path |
| 3 (SHDN) | Shutdown Control | TTL-compatible enable: ≤0.8V = ON, ≥2.4V = OFF - allows direct microcontroller GPIO control |
| 4 (PGND) | Power Ground | High-current return path for switch and diode - must be low-inductance connection to minimize noise |
| 5 (VIN) | Input Supply | Unregulated DC input (4V–24V); requires local 47µF/35V ceramic or electrolytic bypass |
| 7 (SW) | Switch Output | NPN emitter output driving external inductor and Schottky diode - peak voltage reaches VIN + VF(diode) |
| 6, 8 (NC) | No Connect | Not internally bonded; recommended to solder to PCB copper for thermal relief and mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output with ±3% tolerance | Eliminates external feedback resistors and associated layout sensitivity - simplifies BOM and improves production yield |
| 200 kHz switching frequency | Reduces required inductor size by up to 2:1 vs. 52 kHz competitors - lowers solution cost and board area |
| Integrated thermal shutdown and cycle-by-cycle current limit | Provides autonomous fault recovery without external circuitry - enhances system reliability in overload or short-circuit events |
| 100% electrical burn-in tested | Ensures long-term operational stability in industrial environments - reduces field failure risk |
| Standard inductor/capacitor compatibility | Supports off-the-shelf 100 µH inductors and 220 µF output capacitors - accelerates prototyping and sourcing |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting 12V or 24V rail to clean 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/0.5A with line/load regulation better than ±3%. Use Value: Replaces linear regulators to eliminate heat sinks and improve efficiency from ~42% to 77% at full load. | Use Scenario: Providing main 5V supply to microcontrollers, FPGAs, and communication peripherals on compact PCBs. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with integrated shutdown control for power sequencing. Use Value: Enables low-quiescent-power sleep mode via SHDN pin, drawing <200 µA when inactive. |
| Automotive Pre-Regulator | Legacy System Upgrade |
Use Scenario: Stepping down noisy 12V vehicle battery to stable 5V for infotainment head-unit subsystems. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with built-in overcurrent and thermal protection. Use Value: Withstands 24V transients and maintains regulation during cold-crank (down to 4V), improving system robustness. | Use Scenario: Direct replacement for LM2574-5.0 in existing through-hole designs requiring higher efficiency. IC Role / Device Role / Timing Role: Pin-compatible 200 kHz upgrade offering same DIP-8 footprint and identical FB/SW/SHDN/VIN/PGND pin assignments. Use Value: Achieves same 5V output with 2× smaller inductor and 77% efficiency vs. 65% typical for LM2574-5.0. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574-5.0 | 52 kHz switching frequency, ±4% output tolerance, lower efficiency (~65%), same DIP-8 pinout | Larger inductor/capacitor requirements; less suitable for space-constrained or thermally sensitive designs | Select MIC4574-5.0YN when upgrading legacy LM2574-based boards for improved efficiency and reduced passive size. |
| MP1584EN-LF-Z | 1.5 MHz switching, adjustable output, SOIC-8 package, requires external feedback resistors | Higher frequency enables ultra-compact designs but demands careful layout and lacks fixed 5V option | Choose MIC4574-5.0YN for through-hole, fixed-output simplicity; MP1584EN-LF-Z only if board space is critical and adjustable output is acceptable. |
Compared with LM2574-5.0, MIC4574-5.0YN delivers 200 kHz operation and tighter output tolerance in identical packaging; versus MP1584EN-LF-Z, it trades higher frequency for fixed-output ease-of-use and through-hole manufacturability - making it optimal for industrial upgrades and cost-sensitive through-hole production.
Availability
MIC4574-5.0YN is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and automotive pre-regulators requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.
Supply support for MIC4574-5.0YN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with global manufacturing and quality systems certified to ISO 9001 and IATF 16949.
The MIC4574 family was designed as a drop-in, higher-frequency upgrade to the LM2574 for industrial and embedded DC-DC conversion - emphasizing ease of use, minimal external components, and robust fault protection.
FAQ
What is the maximum input voltage rating for the MIC4574-5.0YN?
The MIC4574-5.0YN has an absolute maximum input voltage rating of +40V, but its specified operating input range is +4V to +24V. Operation above +24V is not guaranteed and may cause permanent damage, especially under short-circuit conditions. The device is rated for continuous operation up to +24V with full 0.5A output capability and thermal protection active.
Does the MIC4574-5.0YN require external feedback resistors to set the output voltage?
No, the MIC4574-5.0YN does not require external feedback resistors. As a fixed 5.0V version, its internal resistive divider connects the FB pin directly to the output, ensuring regulation without external components. This distinguishes it from the adjustable MIC4574YN variant, which requires two external resistors to set VOUT.
Can the MIC4574-5.0YN be used as a direct replacement for the LM2574-5.0 in existing designs?
Yes, the MIC4574-5.0YN is pin-compatible and functionally compatible with the LM2574-5.0, sharing identical DIP-8 pinout and basic control interface. However, its 200 kHz switching frequency allows up to 2× smaller inductors and capacitors. Layout changes are optional but recommended to optimize performance and thermal dissipation.
What is the shutdown current consumption of the MIC4574-5.0YN?
The MIC4574-5.0YN draws less than 200 µA typical standby current in shutdown mode (SHDN ≥ 2.4V), with a maximum specified value of 500 µA over temperature. This low quiescent draw makes it suitable for battery-backed or always-on systems where standby power budget is constrained.
Is the MIC4574-5.0YN RoHS-compliant and lead-free?
Yes, the MIC4574-5.0YN is RoHS-compliant and lead-free. Its PDIP package carries the Pb-free JEDEC® matte tin (Sn) designation, and the marking "Y" in the part number indicates compliance with RoHS Directive 2011/65/EU. Full compliance documentation is available in Microchip's packaging specification DS20006472A.
MIC4574-5.0YN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MIC4574-5.0YN FAQ
1.How can I place an order for MIC4574-5.0YN through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4574-5.0YN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MIC4574-5.0YN reliable?
The price and inventory of MIC4574-5.0YN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4574-5.0YN is usually 5 days.
3.What payment methods are accepted for MIC4574-5.0YN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4574-5.0YN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4574-5.0YN?
MIC4574-5.0YN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4574-5.0YN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MIC4574-5.0YN?
For technical support, including MIC4574-5.0YN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4574-5.0YN requirements.
6.How does Aetrix verify that MIC4574-5.0YN is sourced from the original manufacturer or authorized distributors?
All MIC4574-5.0YN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC4574-5.0YN meets industry standards.
7.What is the process for return or replacement of MIC4574-5.0YN?
All MIC4574-5.0YN units undergo pre-shipment inspection (PSI). If there is an issue with MIC4574-5.0YN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MIC4574-5.0YN part is unused and in its original packaging.
Return procedure for MIC4574-5.0YN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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